Nut lock



April 20, 1937. w. N. PESCE NUT LOCK Filed Feb. 7, 1936 INVENTOR WilliamN. Pesce.

Patented Apr. 20, 1937 UNITED STATES PATENT, OFFICE NUT LocK William N.Pesce, Waterbury, Conn. Application February 7,1936, Serial No. 62,767

3 Claims.

This invention relates to nut locks, and more particularly to a nutprovided with means to releasably lock it against rotation in eitherdirection on a bolt having longitudinal grooves, and

which may be set so that it may be rotated only in one direction.

One object of this invention is to provide a nut of the above naturehaving a pawl pivotally carried therein, and which may be releasablylocked either in inoperative position or in 'nutlocking position.

. A still further object is to provide a nut lock of the above naturewhich will be comparatively simple in construction, substantiallyinexpensive to manufacture, easy to install and manipulate, compact, andefficient and durable in use.

With these and other objects in view, there has been illustrated on theaccompanying drawing,

one form in which the invention may be conveniently embodied inpractice.

In the drawing:

Fig. 1 is a side View of a bolt and nut lock combination embodying thefeatures of this invention.

Fig. 2 is an end view of the same.

Fig. 3 is an enlarged partial sectional view of the lock-nut and boltgenerally taken on line 33 of Fig. 1, looking in the direction of thearrows, showing the pawl locked in inoperative position.

Fig. 4 is a partial sectional view taken along the line 4-4 of Fig. 3.

Fig. 5 is a partial sectional view similar to Fig.

3, but showing the pawl in nut-locking position.

Fig. 6 is a sectional view taken on line 6-6 of Fig. 5.

Referring now to the drawing in which like reference numerals denotecorresponding parts throughout the several views, the bolt and nutcombination selected to illustrate the features of this invention isshown in assembled position in Figs. 1 and 2, where the numeral I0indicates a bolt having a hexagonal head II and a shank 5 I2, providedwith a threaded portion 13. A hex a-gonal nut l4 having internal threadsI5 is screwed upon the threaded bolt shank 12 in the usual manner. Thebolt shank l2 has a plurality of V-grooves 16 (three in this instance)cut or otherwise formed therein, which extend longitudinally thereof andare spaced apart circumferentially thereabout. The V-grooves l6 arepreferably formed with one side I! disposed radially with respect to theaxis of the bolt and with the other side 3 of said grooves inclined atan angle thereto. The depth of said grooves is preferably made slightlygreater than the depth of the threads [3.

The locking member for the nut It comprises a pawl 20 which is pivotallymounted on a pin 22 within a radially disposed rectangular opening 2|insaid nut so that it may swing toward I. andaway from the bolt shankl2. The pivoted end of the pawl 20 is bifurcated, as at 23, and embracesa coiled spring 24 which is mounted on the pin 22'. One end of saidspring engages the nut l4 and the other end engagesthe pawl 20, wherebythe latter will be urged inwardly toward the bolt shank l2. The free endof the pawl 28 is pointed, as at 25, for engaging in any one of theV-grooves It in the bolt shank l2.

An angular catch 25 is pivotally mounted upon a pin 2'l located on theouter surface of the pawl 20, and said catch is adapted to swinglaterally with respect to the pawl 20. The catch 26 is provided with ahook arm 28 which is adapted to enter a longitudinal groove or slot 29(see Figs. 1, 3 and 4) formed in a peripheral surface of one face of thenut 14 for preventing the pawl 20 from swinging inwardly upon the pivotpin 22. The hook arm 28 is also adapted to engage in a longitudinalopening 30 (see Figs. 3 to 6), provided in the nut l4 spaced inwardlyfrom the groove 29, and extending into the opening 2|, whereby the pawl20 may be maintained in its locked position within the V-grooves l6 andheld positively against accidental release therefrom. The hook arm 26 isprovided at its end with a beveled edge 3|, to facilitate the entrancethereof into the slot 29 and opening 30.

In operation, assuming the nut l4 has been screwed upon the threadedportion l3 of the bolt l0, and that the pointed end 25 of the pawl 20'is engaged in one of the V-grooves It with the catch 26 in theinoperative position, as shown in Fig. l, the nut may be rotated in aclockwise direction, as viewed in Fig. 2, but Will be held againstrotation in a counterclockwise direction if one attempts to remove itfrom the bolt shank l2. After having advanced the nut 14 along the shankI2 the desired amount, the catch hook 26 may be swung about its pivot tocause the arm 28 thereof to enter the opening 30 in the nut, as shown inFig. 6, whereupon it will be impossible to rotate the nut on the shankin either direction.

When it is desired to unscrew the nut I4 from the bolt shank, it willonly be necessary to unlatch the hook catch 26 and twist the nutanticlockwise sufficiently to cause the pointed end 25 of the pawl 20 toslide up the inclined side I8 of the V-groove I6 and come to rest uponthe circumference of the threaded portion l3. The catch 26 may then beswung in a counter-clockwise direction until the arm 28 thereof entersthe groove 29, whereupon the pawl 20 will be held in its outermostinoperative position, permitting the nut to be freely unscrewed from thebolt.

While there has been disclosed in this specification one form in whichthis invention may be embodied, it is to be understood that this form isshown for the purpose of illustration only, and that the invention isnot to be limited to the specific disclosure but may be modified andembodied in various other forms without departing from its spirit. Inshort, the invention includes all the modifications and embodimentscoming within the scope of the following claims.

Having thus fully described the invention, what is claimed as new, andfor which it is.desired to secure Letters Patent, is:

1. In combination, a threaded bolt having longitudinal grooves in itsthreaded portion, a nut screwed upon said bolt, means carried by saidnut and adapted to selectively cooperate with any of said grooves toprevent rotation of said nut in one direction, and means carried by saidfirst means and engageable with said nut when said first means is inengagement with the groove to prevent rotation of said nut in eitherdirection, said second means being engageable with said nut when saidfirst means is out of engagement with said groove to permit rotation ofsaid nut in either direction.

2. In combination, a threaded bolt having a longitudinal groove on itsperiphery, a nut screwed on said bolt, a pawl on said nut adapted toengage one of said grooves to prevent rotation of said nut thereon inone direction, and a catch swingably mounted on said pawl and adapted toengage in an opening in said nut when said pawl is engaged in a groovetolock said nut against rotation in one direction, said nut having arecess to receive said catch when said pawl is out of groove-engagingposition to permit rotation of said nut in either direction.

3. In combination, a bolt and a nut screwed thereon, a pawl mounted onsaid nut for swinging movement toward and away from said bolt, a springconstantly urging said pawl toward said bolt, said pawl adapted tointerlock with said bolt to prevent rotation of said nut thereon, saidnut having a groove in its periphery and a longitudinally directedopening therein spaced inwardly from its periphery, a catch pivoted tosaid pawl for swinging movement transverse to the swinging movement ofsaid pawl, and v an arm on said catch adapted to enter the groove insaid nut when said pawl is out of engagement with said bolt and to enterthe opening in said nut when said pawl is in engagement with said bolt.

' WILLIAM N. PESCE.

